Belt-shifting mechanism



J. e. LARSH.

BELT SHIFTING MECHANISM. APPLCATION FILED JULY l5, .l92'l.

Patented Apr, 25, 1922.

2 SHEETS-SHEET l.

ym m l. E; LARSH.

BELT SHIFTlN-G MECHANISM.

APPLICATION FILED JULY l5. |92`I.

Patented Apri 25, 1922.

2 SHEETS-SHEET 2.

-UNITEP-STATES- 1 JAiitEs n LRsnQ .or canvro'r.' oiirdnssreivon Torun'Fosproir iyriiiiiiiriffrooi.

- COMPANL or o iivomiiemr, oiirdnooiironiiriouoromo.; Y

nism arranged-in such Vmanner that the .belt may .be projected 1invarious suitable .direc-v having belt-openings therein forV the.oppoitions transverse to fthe :pulleys for readily adaptingthe mechanism for`belt drive from driving pulleysfin .various radial relations to the:tight and loose pulleys. ItV isthe .object of -iny invention, further,to provide a casing arranged to be received. Vabout the driven pulley,and, adjustable about the axis of rotation of the latter, andhavingthereon a belt-shifter movablewith. the casing; further, toprovide a casing ar-` ranged to-contain;v the driven'pulley, and

site 'stretches of'a'belt received aboutthe pulley, .and having thereona belt-shifter acting upon the belt, withtineans whereby the casing withits belt-openings andthe beltshifter may be adjusted :about the vaxis ofrotation ot-.the driven pulley, and `secured iii placein adjustedpositions, for accommo dating va belt regardless of the'` direction fromwhichthe belt projects-radially with I v maybe imparted tothedrill-spindle in any relation tosaid axis of rotation.

@The invention v.will be further #readily understood fromA the followingdescription and claims, and from the drawings in which latter:

Fig. l represents an chine, y,the latter partly brokenawayg -lFig. 3 isacross-section .taken on a line corresponding to the line 3 -30 Fig. l.-v

Fig. 4 is-an end elevation of my improvedj device showing the samearranged in radial position different from that shown in Fig. l, inVfull lines, and in an oppositerelation in V dotted lines, the end platebeing removed. 'F ig. 5 is a plan view of my improved de- 6;. and,

end .elevation vof an embodiment of my invention shown iii-conf, nectionwith ya ,radial'fmetal drilling ma-L sectionjof the same takenpartly onthe -irregularsection 1 at.21forchanging the speeds imparted by adrive-shaft 22 to the shaft 18, through the i vice, with the beltshifterarranged; upper? most. f

Fig. -6 is .a yvertical cross-sectionfof the sama-taken on a linecorresponding tothe line 6?'-6.of- Fig.12. g

, fFig'.y 7.'.is afdetail in longitudinal section taken iny the plane ofthe '1 line ;7:.7 ofi Fig.

: 8 isnadetail in oross-sectie'n onithe v I hayeashownfmy.- improvement,as'` larrangedV in' the driving mechanism of a socalled Vradial drilling4machine for operatf ingon'imetal; The drilling machine may be usualbase v11', which may haveaf work of usual or .ordinary construction,.and is indicated `iii vthe drawings as comprising fa als.v

extends ..upwardly. -A- sleeve or columnvl is located1abo ut lthe post,and is rotatable thereabout i'n usual manner, ,and is ar .ranged to beclamp'ed'to the'postin usual mannen-: The; sleeve Aor.- col u'mi1 hasaiusual radial ldrill-arm4 .projectingradially therefrom, not. shownbecause-well known.

laterally adjustable .drill-head, viii which Va rotatable drill-spindle.is jqurnaled, the latv tejr having secured thereto a usual drill foroperating on the work. Rotative' movements as lwell A as axial-feeding.movements are impartedto'the drill-spindle' by suita-V ble .meohani'sm. The operative movementsv usual .or ordinary manner. Thesepartsj areiiotshown because( well known. The operating inechanism. fori thedrilling yinachine is v,sliowni as comprising -aii upright.

s haftl suitablyjournaled in the post,and

having a bevelfgear v16 fast thereon, whichA i,

ris meshed by a bevel-gear 17, fast on a shaft 1,'8 i i 'lower end ofthe post. l

vA vari ble speed gear-boX--is exemplified medium of aggear 23vhavingspline-key connection 24 with the drive-shaft, and sliding urnaledv .inf bearings 19,I 20'in the lengthwise on said#drive-shaft,v and '.ar-y lranged to be selectively brought into operative relation by means ofa.-,ge ar 38 with a series of 1 gears 25, of differentd-iameters,

187 Soasfto the i rotationsiyandv 'speeds thereof of the shaft 22 to thesha-it 18. Thengear-box maybe on apbase 28.

A tumbler armll has bearings 'abouty the hub of the-"gear 23. A gear 331s journaled inY the tumbler-arm and mesheswith the gear 28, and isarranged tobe selectively meshed with any one ofthe series of gears- 25,and to be held in engaged relation by'a latch 34, operated by ahandle85,1n suitable or ordinary manner. The gear 281s I inmeslrwith the gear 33,butdes vnot mesh with any'of the gears of the nest of gears .The.transmission'is' effected lfrom the drive-shaft 22' tothev gear 23,having 'splinekey connection therewith, tothe gear 33, and

Y f thence selectivelyxthrough any one ofthe nest of gears 25 fast ontheshaft-26.

In-the present exemplication the gearbox is providedl with bearings B8',39, in

which the shaft 22 is journaledThe bearing 38. is exemplilied'as aball-bearing.'V The gear-box is provided with a stud-journal 41recei-ved about the Vbearing38p *j lA ycasing 43c'omprises a bodyportion 44 andv a closing. plate 45, suitably lsecured to I thebodyportion by-means of fbolts 46.' 'The cap 57`is arranged to closetherecess 58 'in' which the'ball-bearing'is located, being se- I cured inplace Vby means of bolts59.

VvThe casing is arranged pivotwise about the yaxis of rotation of thetight pulley and the loose pulley-exemplified as accomplished byproviding the casing with a clamp-bearing 61,- ,which' is yreceivedlabout the studjourn'al4l, andy adjustable about said axis to'- position-the casing rotatively about the pulleys or in selective radial relationthereto., vThis is shown accomplishedby means ofthe clamp-bearing 61,which is receivedy about and snugly fits the stud-journal 41, the said,

clamp-bearing and the endwall 62 of the casing being Vprovided. .with faslit 68, the wallsof which are arranged vto be' drawn't0- ward oneanother Vfor `firmly clamping the bearing` vabout the stud-journal,shown accomplished by means of a screw 64 received' 60 through lugs 65,66, at'the; respective sides of the slit, andhaving a nut 67 receivedover f the threaded endA of the bolt -for 4clamping the 'clamp-bearingabout the 'stud-journal and fixing the casing in position, with thebelt-'openings therein projected inV suitable`- direction to,accommodate.y the vbelt projected from the driving pulley, regardless ofthe radial direction in which thellatter' may be lbcated with'relationtocasing.`

lVhile I haveshown thecasin rotatively .mountechonthe gear-box, it is ovious that 'the same may be rotatively mounted on any other part ordevice in connection `with vwhich it is to operate. It may for instance)be mounted ongthe stud-journal 69 at the base of the drilling machine,with the clampbearing received about and'clamped in se'- lective radialrelation about lsaid stud-journal.

l The casing `is provided with-belt-slots-71,

72, through which' opposite-stretchesv 73, 74, of abelt 75,receivedaboutv theV pulleys, are arranged to project.A They stretchesof` the belt may extend in suitable directions transl verse to :the axesof.: rotation of the pulleys forreceivingpower from a shaft and pulleyarranged parallel or otherwise-with the axis Y of rotation'of thetightland loose pulleys,

and located at a desired .and selective position radially with relationtosaid axes of rotation. Y the belt to be received yfrom a source ofpower located selectively in 'diierent'positions .radially with relationIto ythe axisY of rotation of the pulleys.

the drawings. VvFor example, Fig. 1 illustrates an" arrangement With.-the stretches of the-"belt extendingf in one y direction so aste-reachapulley source. of power,

.whileFig 4sliows a Vdifferent direction for thebeltinfull lines, andastill different p0-.'

sitiontherefor in dottedflines. Other pivotal positions of the casing'may be employed. A' belt-shifter 78'isl mounted on the casouter, endoffwhichthereis a belt-receiving loop 82. This loopisfshown comprisingbelt-contactingV walls at thewrespective ends thereof whichj'are atobtuse angles with relation to -each other, 'so' arranged that when thebelt-shifter is shifted to locate. thebelt upon'the loose pulley 52, thewalls 83, 84, of saidsloopv coact Vwith the belt, whereas, when thebelt-shifter is shifted to place the belt about the tight pulley 5l ofthe mechanism, the walls 85, 86, ofk said lbelt-loopfare'arranged to be`engaged by the belt,'with said rlhe arrangement statedl enables walls atright angles to the plane of the belt. f

The 'belt-shifter further comprises anarm 8,8, shown as projectedradially outward and laterallywith relation to the arm 81,vv andprovided at its outer end withV a Vhandle 89, arranged in spacedrela-tion to the belt-loop, that is to say, the handle of thebelt-shifter is spaced from said loop. The operating arm is so locatedwith relation to the casing and the belt and belt-loop that its .handle95 Several of--these positions are indicated-in 105 ing, this mountingbeing a shiftable mountv ing,shownfon-a-'pivot-bolt 79. Thezbelt-`vshifter` comprises lan Larrn 8l, 'at' the 'isffreeor spaced from thebelt'and4 the va- "riousother yparts of the mechanism, so that thesame'niay be readily shifted throughout the'variousradial 'positionsofthe casing. l

- The belt-,shifter and its loop and handle move with -thel casing intheadjustments of' the latter, Vand the construction and arrangements ofparts providesffor the' adjustments of the casing by mere unclampingrelation of the clamp-bearing''l andthe pivotal swinging 0r rotationorpartial rotationin either direction of thecasing upon the clamp-,bearingsupported bythe' stud-journal, the

clamp-bearing being clamped fixedly Vto and about the stud-journal whenthe partsha'v'e:

been placed-'in' adjusted relation.

The casing is also preferably'provided with means for limiting Atheshifting move'-` ments of thebelt-shifter and forguiding the latter.Thus the casingis provided with a,

drive-shaft and the loose pulley thereon forV ready access to the latterfor lubricatingthe same.

The'belt slots 71, 72, in the body portion of the casing are open-endedat their outer ends for 'readily receiving` the stretches of the belttherethrough. These belt-slots arev arranged to bey closed by the endplate 45, which is exemplified as having the outer end walls 97, 98, forthe belt-slots thereon.

My invention provides a compact mecha! nism arranged to be mounted atthe end of a variable speed gear-box for imparting Inotion at variousspeeds through Vthe gear-box to the mechanism to be driven. Theinvention is Valso employable in other relations.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is:

l. In a deviceof the character described, the combination of a casingfor a tight pulley and a loose pulley, said casing forming a support fora belt-shifter, said casing comprising a bearing on which said casing ispivoted about the aXes of rotationof said pulleys, a belt-shifter. meansfor shiftably mounting said belt-shifter on said casing,

said last-named means and said belt-shifter movable with said casingabout said axes,

and means to fix said bearing in adjusted `positions.

2. In a device of therlcharacter described,

the combination 'ofia casing-for al tiglitripul-l f-l'ey and a loosepulleysaidf casing forming a support for'a belt-shifter andfcomprisingaclamp-bearing whose aXis' is coinciden-t with the axes 'of' saidpulleys, said casing provided 3 with openings l for-the oppositestretches of j t,

afbelt passing about'saidjpulleys, af-beltshifter'ffor said belt, and'means for pivoting said beltishifter. 'to 'said casing, saidclamp-bearingformed las vaf-pivot 'for' said casing" for `adjusting saidvcasing about said coincidentlaxes and arrangedV to clamp 1said casingin adjusted positions. V

tlie'combination of a casing forja-tight pul witha belt-o'pening, saidcasing forminga ysupport for abeltshifter VVfor shifting a belt passingthrough said opening,v a shaft -o'n which said pulleys are mount'edi-avbearing ingfaboutl said lastnamed'f-bearing :whereby to -f adj usttheposition offsaid belteopening lley anda loose" pulley,l -said, casingprovided f labout saidfshaft, said belt-shifter'm'ovable with saidcasing, andmeans'for'Xing-said casing in'adjusted positions.: Y Y

4. In a device ofV the character described, i

the combination VVof a casing, a shaft extending into said casing, abearingv for said shaft, a stud-journal about said shaft, a tight pulleyanda loose .pulley about lsaid shaft in said casing, said casingprovided v with a belt-opening for a belt passing'about said pulleys, a'belt-shifter for vsaid belt,

said belt-shifter-shiftably mounted on and movable with said casing, aclampgbearing for said casing; about said stud-journal arranged foradjustment of said; casing about said stud-journal to position" saidvbelt! `opening and said belt-shifter about the axis of said shift',- andmeans for clampingsaid clamp-bearing about said stud-journal in -v adjusted positions.

5. In a device of thecharacter described, I"

the combination with a speed-changing' gear-box and a .driveeshaftjournaled therein, ,of a stud-journal on saidgear-box about saiddrive-shaft, a tight pulley and a loose Vpulley about said :drive-shaftoutside said gear-boX, a-casing about said pulleys, -said casingcomprising a bearing about said stud.`

journal whereby to pivot said v'casing to said gear-box, said casingprovided withV mounted on said casing, said belt-shifter a belt-opening,a belt-shifter shiftably Y 120 comprising a belt moving part at saidop'ening and a handle spaced from said opening,.,

constructed and arranged whereby to adjust said casingwithsaidbelt-opening and said f belt-shifterV about the axis of saidstudjournal, .and means for securing said casing in adjusted positions.

6. In a device of the character described,

the combination of a casing for a tight pulleynand a loose pulley,Ysaijd casing fpro-I 85 for. said shaft, means forfpivotin-'g'gfsaidycas`-V vided :with a vbody portion in which l said pulleys arearrangedto -be `received and an end closing plate, said b ody-portionvcomprising yaclamp-bearing about the aXes of rotation of said pulleys,y said body portion having open-.ended belt-slots for the oppositestretches` of a belt `received about saidfpul-Y leys,ra belt-shifterl.pivoted on said bodyportion between said belt-slots, andwmeans forsecuring'said end closing plate to said body-.portion whereby to-enclosesaidvrpulc leys and to close the endsof said-beltslotsg saidbody-portionwith said. belt-shifter Y thereon and movabletherewith adjustable onsaidclamp-bearing to project said. beltslots `in different positionsaboutthe v`axes of rotation of said pulleys, -and saidclampbearing-comprising clamping meansy for clamping ,said casing inadjusted positions. 7 In a device of the character described, thecombinationlof Aa casing for a tight Ypulley and a loose` pulley, saidlcasing com# prising a body, portion in which said pulleysarerarrangedto be receivedand a closing plate, said -bodyfv portionlcomprising :a clamp-bearing about the axes of rotation of said pulleys,said body portionqhaving open`-` ended belt-slotsfor thevopposite.stretches of a belt received; about said pulleys, abeltshifter@pivottherefor, and limiting means belt-shifter, saidnpivot andlimi'tin'gmeans located on said body .portion between i said belt-slots, and meansfor securing said'end` closing platetosaidbody portion whereby toenclose said pulleys and to close the rends ofpsaid belt-slots, saidbody portion-with said belt-shifter thereon .and -lloYble therewithladjustablebn, Vsaid *clamp-bearing. to project said 'belt-slots invdiferent positions ,about the axesofrotation otsaidA pulleys, and saidclamp-bearing comprisingclamp-` a c forA limiting` theA shiftingmovements ofzsald 45 i the presence of two ySubc

